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Finding the Fourth Proportional to 211.53, 291.90 and 124.20

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Solution

The fourth proportional to 211.53, 291.90 and 124.20 is: 171.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.53 : 291.90 = 124.20 : x
  2. Step 2: Convert to fraction form
    211.53/291.90 = 124.20/x
  3. Step 3: Cross multiply
    211.53x = 291.90 × 124.20
  4. Step 4: Simplify right side
    211.53x = 36,254.45
  5. Step 5: Solve for x
    x = 36,254.45/211.53
  6. Step 6: Final answer
    x = 171.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.